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A student covers 30 km at 15 kmph, 36 km at 36 kmph and 20 km of the remaining distance at 5 kmph. What is the total time taken to travel?1. 7 hours2. 8 hours3. 6 hours4. 4 hours |
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Answer» Correct Answer - Option 1 : 7 hours Given: Speed to cover 30 km = 15 kmph Speed to cover 36 km = 36 kmph Speed to cover 20 km = 5 kmph Formula used: Speed = Distance / time 1 kmph = 5/18 m/s Calculation: Calculating time taken by each segments ⇒ Segment 1: T1 = 30 / 15 ⇒ T1 = 2 hours ⇒ Segment 2: T2 = 36 / 36 ⇒ T2 = 1 hour ⇒ Segment 3: T3 = 20/5 ⇒ T3 = 4 hours Total time taken = 2 + 1 + 4 ∴ Total time taken is 7 hours |
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